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wxPython – Expand() method in wx.TreeCtrl

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  • Last Updated : 25 Nov, 2020
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In this article, we are going to learn about Expand() method associated with wx.TreeCtrl class of wxPython. Expand() method is used in order to expand and show children nodes of a particular item in Tree Control.

This function takes the tree node item as a parameter to whom we want to expand.

Syntax: wx.TreeCtrl.Expand(self, item)

Parameters:

Parameters Type Description
item wx.TreeItemId Item that we want to associate editlabel with.

Code Example:

Python




import wx 
  
  
class MyTree(wx.TreeCtrl): 
  
    def __init__(self, parent, id, pos, size, style): 
        wx.TreeCtrl.__init__(self, parent, id, pos, size, style) 
  
  
class TreePanel(wx.Panel): 
  
    def __init__(self, parent): 
        wx.Panel.__init__(self, parent) 
          
        # create tree control in window 
        self.tree = MyTree(self, wx.ID_ANY, wx.DefaultPosition, 
                           wx.DefaultSize, wx.TR_HAS_BUTTONS) 
          
        # CREATE TREE ROOT 
        self.root = self.tree.AddRoot('root'
        self.tree.SetPyData(self.root, ('key', 'value')) 
  
        # add item to root 
        item = self.tree.AppendItem(self.root, "Item"
        item2 = self.tree.AppendItem(self.root, "Item"
  
        # expand root 
        self.tree.Expand(self.root) 
          
        sizer = wx.BoxSizer(wx.VERTICAL) 
        sizer.Add(self.tree, 0, wx.EXPAND) 
        self.SetSizer(sizer) 
  
  
class MainFrame(wx.Frame): 
  
    def __init__(self): 
        wx.Frame.__init__(self, parent = None, title ='TreeCtrl Demo'
        panel = TreePanel(self
        self.Show() 
  
  
if __name__ == '__main__'
    app = wx.App(redirect = False
    frame = MainFrame() 
    app.MainLoop()


Output:


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